Had a relative pick this up for me at an antique store recently. Despite the rust its still actually in very good mechanical working order. I have looked it over pretty closely to try to discern who may have manufactured it and when but, aside from some faded letters on the outside that appear to been painted on the metal, there don't seem to be any clues. It looks like too much engineering on the mechanism for it to be homemade. Anyone out there with any ideas?